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A neural pathway involved in a reflex response. For example, when your knee is tapped below the kneecap, causing the leg to jerk upwards. At its simplest a reflex arc can consist of just three neurons: one that reacts to the stimulus, which connects via another in the spinal cord, to a motor neuron that tells a muscle to react. Bypassing the brain in this way produces a quicker reaction.

For example, when your knee is tapped below the kneecap, causing the leg to jerk upwards. At its simplest a reflex arc can consist of just three neurons: one that reacts to the stimulus, which connects via another in the spinal cord, to a motor neuron that tells a muscle to react. Bypassing the brain in this way produces a quicker reaction.

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